Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 144,213	$ 132,914
Accounts receivable, net of allowance of $4,997 and $5,067, respectively	350,307	378,397
Prepaids and other current assets	125,849	104,597
Income and other tax receivables	43,489	40,894
Total current assets	663,858	656,802
Long-term assets
Property, plant and equipment, net	168,697	178,706
Operating lease assets	112,129	120,820
Goodwill	362,862	363,502
Deferred tax assets, net	15,534	15,081
Other intangible assets, net	107,525	112,059
Other long-term assets	65,048	69,438
Total long-term assets	831,795	859,606
Total assets	1,495,653	1,516,408
Current liabilities
Accounts payable	49,343	66,658
Accrued employee compensation and benefits	161,792	163,658
Other accrued expenses	72,004	55,915
Income taxes payable	36,503	19,709
Deferred revenue	34,220	39,956
Current operating lease liabilities	43,043	43,651
Other current liabilities	6,041	6,623
Total current liabilities	402,946	396,170
Long-term liabilities
Line of credit	339,000	385,000
Deferred tax liabilities, net	6,400	7,747
Non-current Income Taxes Payable	22,271	22,291
Non-current operating lease liabilities	89,967	98,277
Other long-term liabilities	100,154	96,185
Total long-term liabilities	557,792	609,500
Total liabilities	960,738	1,005,670
Redeemable noncontrolling interest	54,674	52,976
Stockholders' equity
Preferred stock - $0.01 par value: 10,000,000 shares authorized; zero shares outstanding as of March 31, 2021 and December 31, 2020	0	0
Common stock - $0.01 par value; 150,000,000 shares authorized; 46,819,468 and 46,737,033 shares outstanding as of March 31, 2021 and December 31, 2020, respectively	468	467
Additional paid-in capital	359,030	360,293
Treasury stock at cost: 35,232,785 and 35,315,220 shares as of March 31, 2021 and December 31, 2020, respectively	(599,851)	(601,214)
Accumulated other comprehensive income (loss)	(80,713)	(72,156)
Retained earnings	787,598	757,312
Noncontrolling interest	13,709	13,060
Total stockholders' equity	480,241	457,762
Total liabilities and stockholders' equity	$ 1,495,653	$ 1,516,408